Jaw chuck



July 8, 1952 K. DEURING El AL JAW CHUCK Filed Dec. 17, 1948 *ourinventlon relate 'totrahsm tie esbyts r Patented July 8,

. v V g, l ue s' nd m r :pa t eui'arli w e i nt in aw cihttksad pt t ten e. in l t e' -am w. rm i im hes a well asin cireu lar gri ding nd related machines. 1 n nt o ir'e e s itiwb y s r 'e' o i d: w h aw t whiske s" e m n y 1eth1b9ks mpvahleie wis la n t e Pu im mega e l 'nt' wbithi to secure uniform m tipnf *ofthe-wedg {blocks has the f tm er a dfivineq ine' tetra b hin h wed e'n cksandradia i' l ts. f 'h th t nes SEQ jr vie t vot n. thewsfis s a prev nt p slite aY'Q Q t-t e s 1 teeth an g ar H v n bee .us asi' er fldtme e n a .jri ia l a C n ctv j nlryte w en thw 'c an isear' t et L w r 7 5 he aili V d sien he strength of t e s r teethlimited thesmalle'stpossible external diamete r of aehuclg of this type to about 7; The greaterstrehgth itithe new connection together with the factthatas'a gear is missing the wedge blocks can be arrangedeloser to the central hole of the chuck'finake'i possiblto build much smaller chuoks without an'y paiit becoming too weak.

Other mprpveme tszwill he seen item the lowing description. The drawing shows a three jawis'el'f' pentring chuck inQQrDQrating the .new i ii t '0 .l a 1 i mnt w art al i fseetion', andiFi'g."2 a; cross sei 91.1 on lineAQB dfFi'g'tl.

The wedge blocks "Ahguidd in tangential grooygasi. provided in the chuck body I -a.1 e adiust hl 'w; me ns 1 ne visled with s raight te h.v said is as ,v-, being The spindle 3 is guided in a wedge block'4 kept in its axial direction by means of thrust bearings 6 and I, the wedge block constituting a nut. The pindle 3 can be turned by a key fitting to the square head 8.

According to our invention each wedge block has on its rear face a pivot 9 on which a stone [0 rides. Each stone l0 slides in a radial slot provided in a driving ring II, which is mounted on the huh I! of the chuck I behind the wedge blocks 4. By turning the spindle 3 the corresponding wedge block 4 is moved in its groove, and at the same time the driving ring II is turned by the pivot 9 and stone Ill of the wedge block- ST TE E' T F CE .I AW CHUCK Karl Deuring and Franz Kreutzeh Dusseldorf, Germany V i Application December 17, 194s,1ser ia1No.s5,s44. I j In France-January2,1948 f: v

- 8Glaim s. (Cl. 279-116) 4, and in addition, the othe'rwedgeblocks are thereby moved; I 7

As the inelined straight teeth 5 of the wedge block 4 mesh with corresponding teeth 4 3 -oii tlie base jaws [4 these are-radially 'moved' when the wedge blocks are moved along their grooves.

No teeth being;-as is knownprovided on the forward ends 4a of thewedge blofcks4 teeth 5 and I3 are-disengaged, when the 'Wedge blpcks are'in the rearmost" or starting pos tion; i. 'e'. when the threaded wedge block 4 rests against the faqe of thrust bearing 6. In this position each Jaw I4 is held-in plac'e'by a'short'tooth- I 5; or-jawholder, which is movably mounted 'withinfthefohucl; body I and'pressed intothe teething l 3' of jaw-by a spring 16 (Fig; 2;). The jawisthereby-put in the correct starting'position'in' whichthe teeth 50f the wedge block 4 will readily find the spa'ees between the teeth l3. I j a a By overcoming the jaw holder -I 5 each-jawcan oe shifted'by hand by oneor more teeth or can be pulled out of v the chuck altogether. This serves to pre-set thejaws for thedesired grip ping diameten; Spacsqot toothare not cut to the very ends of base jawl 4 so that-eatzh 'end-has a somewhat thicker tooth was fing'ag'efiiehtflof teeth 5 and-l 3 is --therefore"made impossible un less all teeth Sengage aspace of toothi-ng l3. It is impossible to i s'e the' chuck -with but one, or two teeth 5 of-ea'ch wedge block beinginmes'h When teeth 5 andl3 are' 'o t of mesh w edge blocks 4am in the starting n ition and the rib 4 which has the fiam lfligilt :as teeth :5- remains on theother -side otb'ase jaw I 4 andserves for a; dirt seal preventing dirt 0f all kinds from getting into the interior-of thechuc'k when -the jaws are taken outof the ehucl; body for clean- 'ing purposes, As in 'lmo-wn chucks of this type js'i w's and wedge blo'ck s me'et-at rig-ht angles there remains, for-reasons of symmetry, in the end pm sition of the wedge block, when its stands close to thrust bearing 1, a portion of the Wedge block having the same width as rib 4b useless on the other side of the base jaw l4. With a view to avoid this disadvantage there is according to the present invention made the angle a between jaws and wedge blocks (see Figure 1) a little smaller and, in addition, the wedge block 4 a little shorter, so that in the aforementioned end position the teeth Erather do not quite cover the full width of the base jaw I4. As there is no central gear formerly used for connecting the wedge blocks with each other the grooves can be arranged closer to the center of the chuck and, consequently, made longer. Longer grooves and shorter wedge blocks result in a greater stroke of the latter and this allows at a given pitch of teeth and I3 a smaller inclination angle of teeth 5 and therefore either greater gripping power or less eflort for handling the key.

Between two adjacent grooves 2, preferably close to the spindle square 8, an indicating pin I1 is guided in a hole of the body I, parallel to itsaxis. The pin has a shoulder and the hole is countersunk, thus making space for a compression spring I9, which forces the pin against the forward face of driving ring ll. l8 in that face controls the indicating pin so that it indicates the ends of the stroke of wedge blocks 4 and also insumcient engagement .between teeth 5 and I3 by projecting over the front'face of the chuck body I. In that portion of the stroke where the tooth engagement is suilicient the head of pin l1 rests in the groove and its outer end is flush with the chuck body.

Upper jaws 20 are fixed to the base jaws M by means of screws 2|. The chuck body is closed by a cover 22. Screws 23 hold it to the adaptor plate 24 or other suitable means for connecting the chuck to the spindle of a machine.

We wish it to be understood that we do not desire to belimited to the exact details of con- A groove struction shown and described, for obvious modiflcations will occur to a person skilled in the art.

We claim: 1. In a chuck having a plurality of clamping jaws respectively mounted for movement along radially extending paths to and from operative a ing a pin and slot connection with said ring operative to rotate said ring in response to transverse movement thereof relative to the jaw actuated thereby, rotation of said ring by one of said connections being effective through the remaining pin and slot connections to impart equal transverse movements to the wedges connected with such remaining connections.

.2. A chuck as claimed in claim 1 wherein said slots extend radially with respect to said ring and said pins extend parallel to the axis of said ring. v

:3.:The invention'defined in claim 2 characterized by each of said connections having a bearing slidable in its slot, and a pivotal connection between the bearing and pin of such connection.

4. A chuck as claimed in claim 1 wherein said slots are formed in said ring and extend radially thereof, and said pins are connected with said wedges and extend parallel to the axis of said ring.

terized by each of said slots having a bearing slidable therein and a pivotal connection be- 5. The invention defined in claim 4 charactween each of the bearings and one of said pins.

6. A chuck comprising a body having a' plurality of radially extending slots therein; each of said slots having a clamping jaw slidable therein, actuating wedges movable along paths respectively extending transversely of each of said slots, and intermeshing rack-like teeth on said wedges and jaws for imparting radial movement to said jaws in response'to-transverse movement of said wedges, said'wedges each having a path of movement inclined slightly from a position at right angles to the center line of the slots in which the jaw cooperating therewith slides to thereby enable the use of a shorter wedge than otherwise possible. is '7. A chuck comprising a body having a plurality of radially extending slots therein, each of said slots having a clamping jaw slidable therein, actuating wedges movable along paths respectively extending transversely of each of said slots, and intermeshing rack-like teeth on said wedgesv and jaws for imparting radial movement to said'jaws in response .totransversemovement of said wedges, there being a greater number of teeth on said jaws than on said wedges and such teeth being inclinedslightlywith respect to. a line normal to the path ofmovement of said jaws, said jaws each having-an enlarged tooth at the ends thereof to prevent the teeth on said wedges meshing with a number of teeth on said jaws smaller than on said wedges. v

8. In a chuck having a plurality of clamping jaws respectively mounted for movement along radially extending paths to and from operative clamping positions and actuating wedges movable transversely of-such paths for imparting radial movement to smaqaws, acontrol ring rotatable in said chuck, each of said wedges having a connection withs'aid control ringsuch that a transverse movement of .one of the wedges will impart through said ring equal transverse movements to the remaining wedges, an indicator for indicating the relative position" of said wedges with respect to said Jaws, and means actuated by rotational movement of said ring for 1 operating said indicator. p r g DEURING.

. FRANZ KREUTZER.

REFERENCES CITED The following references'are ofrecord in the file of this patent:

UNITED sTA'rEs PATENTS 

